i think the instructions they gave was supposed to be after cooking, but if you wanted to make the tart ahead of time you could make the dougth and filling and store separately (the dougth wrapped in plastic wrap and the filling in a plastic container) in the fridge, and when you're ready to make it roll out the dough and fill and bake

Sorry, I should have clarified in the initial recipe, the tart can be stored for a week once it has been baked. There dough can be frozen for a month (maybe longer) once it has been double wrapped in plastic.